JP7451674B2 - Floating foundations for offshore wind turbines, systems for extracting energy from the wind and methods of installing wind turbines - Google Patents

Description

The present invention relates to the field of construction foundations, in particular of offshore wind turbine foundations. FIELD OF THE INVENTION The present invention relates to apparatus, systems, and methods for supporting floating offshore wind turbines.

Continuing efforts are being made towards renewable energy. As part of this continuing effort, significant investment and technological advances are being made in the field of offshore wind energy extraction technology.

To harvest energy from offshore wind, it may be desirable to erect wind turbines in deep water. For such purposes, floating foundations may be highly desirable.

Many examples of floating offshore wind turbine foundations already exist. An example is known from WO 2004/061302 (A2), in which a floating foundation for a wind turbine is disclosed, which foundation essentially comprises at least three underwater buoyant bodies connected to the lower end of the wind turbine. Prepare for.

Hywind is another example of a floating foundation, with a spar buoy as the base of the wind turbine. The Hywind spar buoy is difficult to install because it is heavy and inflexible.

International Publication No. 2004/061302

The aim of the invention is to improve or reduce at least one drawback of the prior art.

According to a first aspect of the invention, there is provided a floating foundation for an offshore wind turbine comprising a central pipe, a buoyancy section, a weight section and a plurality of wire ropes, the floating foundation comprising:
- a buoyant section is connected to the central pipe in order to provide buoyancy to the floating foundation and keep it afloat;
- in order to provide stability to the floating foundation, a weight section is connected to the lower end of the central pipe;
- a plurality of wire ropes are arranged to extend and connect between the buoyant part and the weight part, are tensioned and are configured to impart bending strength to the floating foundation when tensioned ; It further comprises a plurality of hoisting means for lowering or raising the central pipe of the floating body foundation, the plurality of hoisting means pulling out or retracting the wire ropes, each wire of the plurality of wire ropes connecting the buoyancy section and the weight section. Multiple winches for raising or lowering the central pipe of a floating foundation by increasing or decreasing the length of the rope.

The wire rope may be a tensioned wire rope.

The buoyancy part may be fixed to the central pipe. The buoyant part may be fixed to the upper end of the central pipe. The buoyant section may be movably coupled to the central pipe in such a manner as to allow movement of the central pipe relative to the buoyant section. The buoyant portion may be lockable to the central pipe to prevent movement of the central pipe relative to the central pipe. The buoyant portion may be releasably lockable to the central pipe.

The lower end of the central pipe may be the opposite portion of the central pipe to the upper end of the central pipe. The buoyant part may be fixed to the lower end of the central pipe.

The wire rope may be a fiber rope, a steel wire rope, a chain, a hybrid rope such as a rope containing a mixture of steel and fibers, or any other type of rope suitable for the purpose. Adding bending strength through the use of said multiple wire ropes under tension allows for a relatively lightweight design with sufficient structural strength to support the wind turbine, especially sufficient support to resist bending forces. become.

At least one or more of the plurality of wire ropes may extend from an outer portion of the buoyancy section to a portion of the weight section. All of the plurality of wire ropes may extend from the outer portion of the buoyancy section to the weight section. One or more or all of the wire ropes may extend, for example, to the top, bottom, outside, middle, and/or inside of the weight section.

The wire ropes are connected to the buoyant and weighted parts using means and methods known to those skilled in the art, such as using typical wire sockets or any other type of connecting device suitable for the purpose. obtain. The wires may be connected to the weight using means that can be operated by the ROV (eg, using a fork mount or any other type of connecting equipment, instrument, or gadget suitable for the purpose).

The central pipe may be open at its lower end to allow water to enter the central pipe. Pipes that are closed at the bottom must resist water pressure, which can exert an upward force on the pipe from the bottom of the pipe, which may be undesirable. For foundation stability purposes, it may be advantageous to avoid applying buoyancy forces to the central pipe from the bottom of the central pipe. Opening the central pipe at its lower end may advantageously allow for an at least partially hollow central pipe, which is lighter than would be required if the ends were closed. The basics may be possible.

The buoyant section can be a section with a relatively low specific gravity, which can be significantly lower than the specific gravity of water, thus providing buoyancy to the foundation and keeping it afloat. The buoyant portion may have a density, for example, 0.9 times the density of water, 0.8 times the density of water, 0.7 times the density of water, or 0.5 times the density of water. The buoyancy force exerted by the buoyant part on the foundation through a combination of the size and specific gravity of the buoyant part needs to be sufficient to ensure that the foundation can float even while the wind turbine is mounted on the foundation. . Note that parts other than the buoyant section may apply buoyancy to keep the foundation floating.

The buoyancy section may include a ring that is coaxial with the central pipe. The ring may be made of or include pressed composite material and/or steel or another suitable type of metal, or pressed RIB material. The buoyant portion may be, for example, substantially toroidal, conical, cylindrical or toroidal, or any other shape suitable for the purpose. The buoyancy section may be configured around a central pipe. The buoyant portion may have a central hole, and the central hole may have a substantially circular shape to allow the central pipe to extend through the central hole. The central hole may have other shapes than circular.

The weight portion can be a portion with a relatively high specific gravity, which can be significantly higher than the specific gravity of water. The weight portion may have a density that is twice the density of water, four times the density of water, or ten times the density of water. The weight portion may be relatively small in area and volume, yet still have a significant mass. The weight portion may have a significantly smaller diameter than the buoyancy portion. The weight part can improve the stability of the foundation when placed in a body of water due to the gravity pulling the weight part and thus the lower end of the central pipe downward.

The weight part may for example comprise a plurality of prefabricated elements that can be connected to the lower part of the central pipe during installation at sea and in ports. The weight section may comprise one or more tanks, which may be filled with a material of high specific gravity, such as iron ore or heavy concrete, for example.

The foundation may include a platform. The platform may be an access platform and/or a working deck. The platform may be coupled to the foundation. The buoyancy section may include a platform.

The hoisting means may be usable to change the distance of the weight part from the buoyancy part and thus raise and lower the central pipe. The hoisting means/winch may typically be placed on the buoyant part and may typically be configured to retract or withdraw the wire rope connecting the buoyant part to the weight part. This is advantageous, for example, for erecting foundations, launching foundations in docks where the water depth is insufficient for a fully lowered central pipe, installing wind turbines on foundations, servicing wind turbines, etc. obtain. The foundation may further include a locking mechanism for releasably and selectively locking the central pipe in a position (e.g., relative to the buoyancy section). The winding means may also be referred to as a winding device.

By changing the distance between the buoyant part and the weight part using hoisting means, the center of gravity of the foundation can be changed. This may be advantageous for many different reasons, including transportation and/or launching of the foundation, installation of the wind turbine, and/or maintenance of the foundation or wind turbine mounted on the foundation, etc.

The one or more hoisting means may be configured and/or suitable for tensioning the one or more wire ropes.

The one or more hoisting means may be configured to retract or unwind the one or more anchor wire ropes.

The foundation may include one or more actuators that may be configured in connection with the one or more wires to retract or withdraw the one or more wires. The one or more hoisting means may comprise one or more actuators. The actuator may be configured to adjust the length of the unraveled wire rope upon receiving a signal from the controller or control device. The controller may be an operator remotely connected to the actuator. The base may include a communication device for remote connection to the operator for remote communication with the operator. The operator may be a manual operator and/or a computing device or operating system configured to communicate with the communication device.

The foundation may, for example, include a control device that may be configured to adjust the settings, status, position of the foundation or part of the foundation. The control device may be operable, for example, by the depth of the weight in the body of water, the activation or deactivation of hoisting means, the release or tensioning of a wire rope, or by using one or more electrical signals. Any other equipment of the foundation may be configured to adjust. The control device may be configured to be connected to the communication device.

The foundation may be equipped with one or more sensors to obtain information regarding, for example, wind speed, wind direction, wave height, air or water temperature, orientation of the foundation, location of weights, and the like. The control device may include or be connected to one or more sensors. The controller may be configured to receive information from the one or more sensors and/or operate equipment, such as an actuator, in response to information from the one or more sensors, e.g. The sensor may be configured to operate according to information from the one or more sensors.

The weight portion may be movably coupled to the central pipe. The weight portion may be movable horizontally and/or vertically. The weight can be moved, for example, by using hoisting means. By moving the weight, the force component applied from the weight to the central pipe can be adjusted, and thereby the effect of the weight on stabilizing the foundation can be adjusted. Adjusting the force components by moving the weight part relative to the central pipe can improve the stability of the foundation, e.g. by countering the forces acting on the foundation from the wind or waves or against the forces acting on a wind turbine on the foundation. Can help improve sex.

The control device may, for example, automatically move the weight to the central pipe and/or in response to information collected by one or more sensors or in response to manipulation by a local or remote operator. It may be configured to move relative to the buoyancy section.

The control device may include instrumentation commonly used in heave correction systems, such as a so-called MRU (Motion Reference Unit). The MRU may include one or more of the one or more sensors described above.

The controller includes a computer for reading, processing, storing, analyzing, and/or responding to information from communications received from the MRU and/or from one or more sensors and/or from an operator. The device may further include a central processing unit (CPU), other computer-related hardware, code and/or software including one or more algorithms. The controller may be part of or include an active heave correction system (AHC).

The AHC may include, for example, one or more wires, one or more hoisting means, one or more actuators, one or more computing devices, one or more sensors, and/or one or more software may be included. The AHC may be configured to shift the position of, for example, a weight section, a central pipe, a wind turbine located on a foundation, etc., depending on wind, wave, and/or water current conditions within the body of water.

The foundation may further include a locking device for releasably and selectively locking the weight to the central pipe.

In addition, the buoyant part and/or the weight part and/or the tower are subject to the risk or severity of damage caused to the tower and/or the buoyant part and/or the weight part when the tower is moved relative to the buoyant part and/or the weight part. One or more guidance devices and/or cushioning devices may be included to reduce noise and/or facilitate ease of movement.

In a second aspect of the invention there is provided a system comprising a foundation according to the first aspect of the invention, further comprising a wind turbine for extracting energy from the wind, standing on the foundation.

The system may further include means for mooring the foundation to the seabed. The means for mooring the foundation to the seabed may include one or more anchors and one or more anchor wire ropes (such as fibres, wires, or chains) or different types of anchor wire ropes connecting the foundation to the anchors. combination). The one or more anchors may be connected to the foundation weight, buoyancy, and/or central pipe using one or more wire ropes. Means for anchoring the foundation are sometimes referred to as anchoring devices.

The upper end of the central pipe, or a separate tubular member extending from the central pipe, extends above the buoyancy section and may be used to connect the mast of the wind turbine to the foundation. The masts may be connected using any means/devices and/or methods known to those skilled in the art.

In a third aspect of the invention, a method of installing a wind turbine is provided. This method is
- preparing a floating foundation according to the first aspect of the invention;
- attaching the mast to the floating foundation and connecting the mast to the central pipe;
- attaching the nacelle to the top of the mast;
- mounting a plurality of rotor blades on the nacelle.

In each embodiment, the floating foundation is provided with hoisting means for raising and lowering the central pipe, the method comprising:
- lowering the central pipe and therefore the mast before installing the mast, nacelle and multiple rotor blasts;
- raising the wind turbine by raising the central pipe after installing the mast, the nacelle, and the plurality of rotor blasts.

It also describes how to perform wind turbine maintenance, which includes:
- lowering the central pipe and therefore the wind turbine;
- a process of performing maintenance on a wind turbine;
- raising the wind turbine by raising the central pipe.

Lowering and raising the central pipe can be carried out using hoisting means. Lowering may be performed by respectively increasing and decreasing the length of wire rope uncoiled from each of the plurality of winches to increase the distance between the buoyancy section and the weight section.

A method for launching floating foundations for wind turbines is further described, which method:
- preparing a foundation comprising hoisting means according to the first aspect of the invention;
- maintaining the weight in the raised position;
- launching the foundation into the sea;

A method for transporting floating foundations for wind turbines is further described, which method:
- preparing a foundation according to the first aspect of the invention, comprising hoisting means;
- maintaining the weight in the raised position;
- including the step of transporting the foundation.

Transportation of the foundation can be by sea, land, or air. An elevated position is a position where the weight part is closer to the buoyant part than where the weight part is typically located when the weight part is installed at sea, either before or after installation of the wind turbine.

The foundation can raise the weight part to its raised position by raising the central pipe using hoisting means. The weight can then be lowered into the operating position by lowering the central pipe using the hoisting means.

Keeping the weight part close to the buoyant part may be advantageous, for example, for reasons related to balance and/or stability during transport, and/or keeping the weight part close enough to accommodate the foundation in its operating position. It may be advantageous in ports where there is no deep water to enable the foundation to be launched into the sea.

It may be advantageous to keep the wires under tension/prestressed while raising and lowering the central pipe to avoid rocking movements and/or to keep the structure stable.

The foundation may include a jack to keep the wire under tension during raising and lowering of the central pipe. The method may include using a jack to keep the wire rope under tension while raising and lowering the central pipe. The method may include tensioning the wire rope. Tensioning the wire rope may include tensioning the wire rope using hoisting means.

A mast may be constructed from multiple parts. Each part of the mast can be installed one after the other, typically the bottom part is installed first and the top part last. The nacelle may typically be attached to the top section after attaching the top section over other parts of the mast.

The central pipe may be lowered and/or raised multiple times during installation. The central pipe can be held/locked in a number of different positions. One such position may be the lowest possible position. Another location could be as high as possible. Other positions may be intermediate positions between these two extreme positions.

This mounting procedure may be a very advantageous mounting procedure, as it may allow, for example, the nacelle and blades to be mounted at a height lower than that of a fully erect mast. As a result, the demands on e.g. lifting of the equipment may be relaxed during installation compared to if the mast could not be lowered during installation.

Tensioning the wire rope applies compression to the central pipe, which may increase bending strength and/or otherwise improve foundation stability. The tensioned wire rope may be prestressed. When sufficient tension is applied to the wire rope, the wire rope can force the weight against the central pipe, forcing the central pipe against the locking mechanism. This can lead to pre-tensioning of central pipes, locking mechanisms and/or weights, which can be extremely detrimental to the ability of the foundation to withstand bending loads and/or to ensure foundation stiffness and stability. Can be beneficial.

A method for providing stability to foundations for offshore wind turbines is described, which
- preparing a foundation having a weight part, a buoyancy part, a central pipe, a locking mechanism, one or more hoisting means and a plurality of wire ropes, the weight part and the buoyancy part being in the center; a plurality of wire ropes each having a hoisting means connected to the pipe, a locking mechanism locking the buoyancy section to the central pipe, and a wire rope extending between and connected to the weight section and the buoyancy section; connected to at least one of the one or more hoisting means for retracting or retracting the wire rope;
- pretensioning the wire rope using hoisting means, including pressing the weight against the central pipe and pressing the central pipe against the locking mechanism, thereby compressing the central pipe;

This method can advantageously provide the foundation with an excellent ability to withstand bending loads and stiffness, which can be advantageous for the stability of the foundation.

In a fourth aspect, a method is provided for improving foundation stability for an offshore wind turbine, the method comprising:
- preparing a foundation, the foundation having a weight, a platform for a wind turbine, and an active heave compensation system, the active heave compensation system comprising at least one wire rope and at least one wire rope; The active heave correction system comprises a sensor, at least one actuator, at least one hoisting means, and at least one controller, the active heave correction system is configured to change the position of a weight relative to a platform for a wind turbine. wherein the at least one hoisting means is connected to the at least one wire rope, the controller is connected to the at least one sensor for receiving data from the at least one sensor, and the controller is connected to the at least one sensor for communicating signals to the at least one wire rope. connected to at least one hoisting means for operating said hoisting means to withdraw or retract the wire rope;
- changing the position of the weight part by changing the tension on at least one wire rope connected to the weight part by withdrawing or retracting the at least one wire rope by a length using at least one hoisting means; the step of changing the position of the weight portion as a result of the control device processing the data acquired by the at least one sensor and in response transmitting a signal to operate the at least one hoisting means. and a step to be performed.

The foundation described above may be an embodiment of the foundation according to the first aspect of the invention. The platform of the wind turbine may be, for example, the upper end of the central pipe of the foundation. The change in the position of the weight can be a change in the position of the foundation relative to the central pipe. One of the greater than one or all of the base wire ropes is part of an AHC system and automatically changes the position of the weight in response to data acquired by the at least one sensor. It can be configured as follows.

The active heave correction system and method improves foundation stability by actively holding the tower in a substantially vertical position and/or by reducing pitch and roll, for example. may be applied.

Although the central pipe may have a non-uniform outer diameter, it is advantageous if the central pipe can have a uniform outer diameter along its length. The central pipe may have a uniform internal diameter, but advantageously it can have a non-uniform internal diameter along its length. It may be advantageous for the central pipe to have a non-uniform thickness along its length. For example, it may be advantageous for the central pipe to be thicker, for example in the vertical middle part of the pipe, than for example at the bottom or at the top. However, the central pipe may be thicker at the top or bottom. Advantageously, the thickness can be greater, for example in the middle part, in order to resist buckling.

The foundation according to the invention is typically longer than other foundations known from the prior art and can have a central pipe that reaches deeper water depths, thus allowing the weight section to reach relatively deeper depths. It can be held at This allows the point of gravity to be shifted downwards to provide the necessary stability to support a wind turbine in a lighter weight design than designs known in the prior art.

Related prior art documents and their related contents

In the following, examples of preferred embodiments will be described, which are illustrated in the accompanying drawings.

1 is a side view of an embodiment of a foundation according to a first aspect of the invention; FIG. Figure 3 is a side view of a system according to a second aspect of the invention; Figure 3 is a side view of the system according to the second aspect of the invention with the central pipe lowered using hoisting means; FIG. 3 is a cross-sectional view of the upper portion of one embodiment of the foundation.

It is noted that the embodiments shown in the figures are merely examples of the invention and are not necessarily drawn to scale. Other embodiments with different configurations than those shown in the figures may be within the scope of the invention according to the claims.

FIG. 1 shows a first embodiment of the present invention having a central pipe 110, a buoyancy section 120, a weight section 130, and a plurality of tensioned wire ropes 140 connecting the buoyancy section 120 to the weight section 130. Figure 1 shows the basis 1 according to the aspect. Both buoyancy section 120 and weight section 130 are coaxial with central pipe 110.

The buoyancy part 120 has an upper part 121 and a lower part 122, and the diameter of the upper part 121 is larger than the diameter of the lower part 122. The plurality of wire ropes 140 are fastened to the upper part 121 of the buoyancy part 120 and extend from the upper part 121 to the middle part 131 of the weight part 130.

The buoyancy section 120 applies a buoyant force to the foundation 1, allowing it to remain afloat while supporting a wind turbine (not shown). The weight section 130 provides a center of gravity that improves the stability of the foundation 1 by adding weight to the bottom of the central pipe 110.

If a force is acting on the foundation 1 in such a way as to cause it to tilt, the weight 130 with the help of gravity will provide stability by counteracting the tilt. The tilt will cause the bottom of the central pipe 110 to rock upward. However, gravity will counteract the tilt by acting on the weight portion 130 and counteracting its upward movement by pulling the weight portion 130 downward.

Furthermore, in the case of a sloped foundation 1, the forces causing the foundation to slope are likely to be primarily forces acting on the above-water portion of the foundation 1, typically from a wind turbine attached to the foundation 1. The force will cause the foundation 1 to tilt, and then the force will be transmitted from the underwater part of the foundation 1 through the central pipe 110 and act on the weight part 130, causing it to lift. The central pipe 110 will act against the force of gravity pulling the weight section 130 downward and will act to lift the weight section 130. This places a bending load on the central pipe 110. The plurality of wire ropes 140 will provide structural strength to the foundation 1, and in particular will provide the foundation 1 with bending strength to withstand bending loads. By providing the plurality of wire ropes 140, any strain due to bending loads will be transferred from the weakened portion of the central pipe 110 to one or more of the plurality of wire ropes 140.

FIG. 2 shows a foundation 1 supporting a wind turbine 2 including a mast 201 and three blades 202. FIG. The foundation 1 is relatively lightweight and compact compared to the prior art, which is made possible by the ingenious use of multiple wire ropes 140 that add bending strength to the structure.

2 and 3 show an embodiment of the foundation 1 comprising a plurality of winches 150 for lowering and raising the central pipe by pulling out or retracting a plurality of wire ropes 140 by a length. These figures show a wind turbine 200 with a mast 201, a nacelle 203 and blades 202 attached to a foundation 1. In FIG. 2, wind turbine 200 is in a fully raised position. In FIG. 3, winch 150 has pulled out a length of wire rope 140 so that central pipe 110 and wind turbine 200 are lowered.

Although the wire ropes 140 are shown in these figures extending inwardly toward the central pipe 110 from their connection to the buoyancy section 120 to their connection to the weight section 130, they are connected in the opposite direction. It may extend outwardly from the connection to the buoyancy section 120 to the connection to the weight section 130 and toward the central pipe 110.

The embodiment of FIG. 2 further comprises an active heave correction system including a controller 602 connected to two sensors 601 for collecting information about conditions related to the stability of the foundation 1. Controller 602 is further connected to winch 150 and operates the winch in response to data collected by sensor 601 to direct a length of wire rope 140, which is one wire, to be operated by one winch 150. Pull out or pull in only.

FIG. 4 shows a cross-sectional view of the upper part of the foundation 1 according to the first aspect of the invention. The foundation 1 includes a central pipe 110 connected to a mast 201 via an intermediate tower section 111. Additionally, FIG. 4 shows a buoyancy section 120. A buoyant section 120 is shown comprising a first locking mechanism 161 and a second locking mechanism 162, the first locking mechanism 161 releasably locking the buoyant section 120 to the intermediate tower section 111 and the second locking mechanism 161 releasably locking the buoyant section 120 to the intermediate tower section 111. Locking mechanism 162 releasably locks buoyancy section 120 to central pipe 110.

Furthermore, the buoyancy section 120 comprises upper and lower guide devices 171 for enabling movement of the buoyancy section 120 relative to the central pipe 110, the intermediate tower section 111 and/or the mast 201.

It is noted that the embodiments described above illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. I want to be In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. Use of the verb "comprise" and its conjugations does not exclude the presence of elements or steps other than those listed in a claim. The article "a" or "an" preceding an element does not exclude the presence of a plurality of such elements.

The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Claims (11)

A floating foundation for an offshore wind turbine, comprising a central pipe, a buoyant part, a weight part, and a plurality of wire ropes,
the buoyancy part is connected to the central pipe to provide buoyancy to the floating foundation and keep the floating foundation in a floating state;
the weight part is connected to the lower end of the central pipe to provide stability to the floating foundation;
the plurality of wire ropes are configured to extend and connect between the buoyancy section and the weight section, are tensioned, and are configured to impart bending strength to the floating foundation when tensioned;
The floating foundation further comprises a plurality of hoisting means for lowering or raising the central pipe of the floating foundation, the plurality of hoisting means pulling out or retracting the wire rope and connecting the buoyancy section and the weight section. A floating foundation, the plurality of winches increasing or decreasing the length of each wire rope of the plurality of connected wire ropes to lower or raise the central pipe of the floating foundation. 2. The floating foundation of claim 1 , wherein at least one or more of the plurality of tensioned wire ropes extend from an outer portion of the buoyancy section to the weight section. Floating foundation according to any one of claims 1 or 2 , wherein the buoyancy section comprises a ring coaxial with the central pipe. Floating foundation according to any one of claims 1 to 3 , wherein the central pipe is open at its lower end to allow water to enter the central pipe. Floating foundation according to any one of the preceding claims, wherein the floating foundation comprises a selectively releasable locking mechanism for locking the central pipe in a position. the floating foundation further comprising an active heave correction system;
the active heave correction system includes at least one sensor and is configured to change the position of the weight relative to the central pipe in response to information obtained by the at least one sensor;
Floating foundation according to any one of the preceding claims, wherein the at least one sensor is configured to obtain information related to the stability of the floating foundation within a body of water. A system for extracting energy from wind, comprising the floating foundation according to any one of claims 1 to 6 and a wind turbine. A method of installing a wind turbine, the method comprising:
preparing the floating foundation according to any one of claims 1 to 6 ;
attaching a mast to the floating foundation and connecting the mast to the central pipe;
attaching a nacelle to the top of the mast;
mounting a plurality of rotor blades on the nacelle. The floating foundation is provided with hoisting means for raising and lowering the central pipe,
prior to installing the mast, the nacelle, and the plurality of rotor blades, using the hoisting means to lower the central pipe and thus also the mast;
9. Raising the wind turbine by raising the central pipe using the hoisting means after installing the mast, the nacelle, and the plurality of rotor blades. Method. A method for improving the stability of a foundation for an offshore wind turbine, the method comprising:
preparing the foundation, the foundation having a weight, a platform for a wind turbine, and an active heave compensation system, the active heave compensation system comprising at least one wire rope; The active heave correction system comprises a sensor, at least one actuator, at least one hoisting means, and at least one control device, the active heave correction system comprising: a sensor, at least one actuator, at least one hoisting means and at least one control device; the at least one hoisting means being configured to change position, the at least one hoisting means being connected to the at least one wire rope, and the controller being configured to connect to the at least one sensor for receiving data from the at least one sensor. connected and connected to the at least one hoisting means for communicating signals to operate the at least one hoisting means to withdraw or retract a length of wire rope;
the weight part by changing the tension on the at least one wire rope connected to the weight part by pulling or retracting the at least one wire rope a length using the at least one hoisting means; changing the position of the weight, the controller processing the data acquired by the at least one sensor and in response transmitting a signal to 1. A method, carried out as a result of operating at least one hoisting means. 11. The method of claim 10 , wherein the foundation is the floating foundation of claim 8 .

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